We report a case of pulmonary embolism that occurred after mandibulectomy. A 59-year-old woman underwent mandibulectomy for a keratocyst arising in the left side of the mandible. After being moved for treatment on the morning of the first postoperative day, vomiting, transient uncousciousness, chest pain, and dyspnea suddenly occurred. Pulmonary embolism (PE) was diagnosed on the basis of hypoxia, overload of the right ventricle, and RI scintigraphy of pulmonary blood flow. Heparin was administered intravenously as anticoagulant therapy immediately after the episode. She successfully recorvered from PE and was discharged on the 35th postoperative day.
